The carbon nanotube gatemon qubit
Fuente:
arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
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| _version_ | 1866908506932641792 |
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| author | Riechert, H. Annabi, S. Peugeot, A. Duprez, H. Hantute, M. Watanabe, K. Taniguchi, T. Arrighi, E. Griesmar, J. Pillet, J. -D. Bretheau, L. |
| author_facet | Riechert, H. Annabi, S. Peugeot, A. Duprez, H. Hantute, M. Watanabe, K. Taniguchi, T. Arrighi, E. Griesmar, J. Pillet, J. -D. Bretheau, L. |
| contents | Gate-tunable transmon qubits are based on quantum conductors used as weak links within hybrid Josephson junctions. These gatemons have been implemented in just a handful of systems, all relying on extended conductors, namely epitaxial semiconductors or exfoliated graphene. Here we present the coherent control of a gatemon based on a single molecule, a one-dimensional carbon nanotube, which is integrated into a circuit quantum electrodynamics architecture. The measured qubit spectrum can be tuned with a gate voltage and reflects the quantum dot behaviour of the nanotube. Our ultraclean integration, using a hexagonal boron nitride substrate, results in record coherence times of 200ns for carbon nanotube-based qubits. Furthermore, we investigate its decoherence mechanisms, thus revealing a strong gate dependence and identifying charge noise as a limiting factor. On top of positioning carbon nanotubes as contenders for future quantum technologies, our work paves the way for studying microscopic fermionic processes in low-dimensional quantum conductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_01978 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The carbon nanotube gatemon qubit Riechert, H. Annabi, S. Peugeot, A. Duprez, H. Hantute, M. Watanabe, K. Taniguchi, T. Arrighi, E. Griesmar, J. Pillet, J. -D. Bretheau, L. Mesoscale and Nanoscale Physics Quantum Physics Gate-tunable transmon qubits are based on quantum conductors used as weak links within hybrid Josephson junctions. These gatemons have been implemented in just a handful of systems, all relying on extended conductors, namely epitaxial semiconductors or exfoliated graphene. Here we present the coherent control of a gatemon based on a single molecule, a one-dimensional carbon nanotube, which is integrated into a circuit quantum electrodynamics architecture. The measured qubit spectrum can be tuned with a gate voltage and reflects the quantum dot behaviour of the nanotube. Our ultraclean integration, using a hexagonal boron nitride substrate, results in record coherence times of 200ns for carbon nanotube-based qubits. Furthermore, we investigate its decoherence mechanisms, thus revealing a strong gate dependence and identifying charge noise as a limiting factor. On top of positioning carbon nanotubes as contenders for future quantum technologies, our work paves the way for studying microscopic fermionic processes in low-dimensional quantum conductors. |
| title | The carbon nanotube gatemon qubit |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2503.01978 |